um_read()

Reading data from the designated UM(volatile memory)

Description

int um_read(int $um_id, int $offset, string &$rbuf, int $rlen)

Parameters

$um_id: UM ID
$offset: starting position to read
$rbuf: buffer to save data
$rlen: number of bytes to read

Return Value

number of bytes to have been read

Example

<?php
include "/lib/sd_340.php";
$rbuf = "";
um_read(0, 0, $rbuf, 10); // Reading 10 bytes from address 0 of the UM0
hexdump($rbuf);           // Outputting the data
?>

See also